Jointer attachment for portable electric drills



Aug. 25, 1953 J. J. KONOPA 2,649,874

JOINTER ATTACHMENT FOR PORTABLE ELECTRIC DRILLS 2 Sheets-Sheet 1 Filed Jan. 9, 1950 Joseph J. Kanopa INVENTOR. BY 2 v an Aug. 25, 1953' J. J.. KONOPA 4 JOINTER ATTACHMENT FOR PORTABLE ELECTRIC DRILLS Filed Jan. 9, 1950 2 Sheets- Sheet 2 Jos eph J. Kanapa 1NVENTOR.

Patented Aug. 25, 1953 OFFICE J OINTER ATTACHMENT FOB PORTABLE ELECTRIC DRILLS Joseph J. Konopa, Marshfield, Wis.

. Application January 9, 1950, Serial No. 137,567

2 Claims.

This invention relates to improvements in hand, power tools.

An object of this invention is to accommodate an electric drill by means of an attachment which forms a portable jointer, said attachment including a guide or forward base section which is vertically adjustably fixed to a follower section,said follower section having a bottom opening therein accommodating a rotating cutter, whereby a simple drive connection between the cutter and the electric dril1 forms a portable jointer. I

'Ancillary objects and features such as simplicity of construction, particularly in the attachment of the electric drill with the base, will become manifest in following the description of the illustrated form of the invention.

In'the drawings:

Figure 1 is a perspective view of the device;

Figure 2 is a vertical sectional view of the device of Figure 1;

Figure 3 is a fragmentary longitudinal sectional view of the device shown in Figure 1, illustrating particularly the relationship of the motor and cutter, together with the means of adjusting the forward or guide base section with the rear or follower base section;

Figure 4 is a perspective view of one of the cutter knives;

Figure 5 is an enlarged sectional view with portions broken away showing the bearing and attachment for the cutter shaft; and

Figure 6 is a fragmentary sectional view showing the tongue and groove connection for attachment of the forward base section with the rearward base section.

The instant invention deals with hand type power tools and is a device for accommodating a conventional electric drill, generally indicated at H), so as to form a portable jointer for the purpose of planing rather large objects, as door j-ambs, or any other device or element which needs or requires planing.

The electric drill has its chucks provided with a bit l2 with a pulley l4 disposed thereon. The bit I2 is held in place as a normal cutting bit would be in the drill.

A follower or rear base section I6 is provided with a downwardly opening aperture l8, forming a chamber for a cutter generally indicated at 20. An upwardly opening recess or opening 22 is provided in the base section I6 in order to accommodate the drill I0. A closure clamp consisting of a strap 24 is provided. This closure clamp is used for the purpose of holding the electric drill H) in place within the recess 22. One end of the strap is hinged, as at 26, to the section I6 on one side of the opening 22 and the other end is provided with an aperture 28. A screw assembly, generally indicated at 30, is passed through the opening 28 and into suitable threads in the base section l6, releasably holding the strap 24 in place. A spider 32 is spot welded, riveted, or otherwise secured to the strap 24 and presses against the motor housing of the drill. This direct contact holds the electric drill [0 in place.

Reference to Figure 1 shows that the hinge 26 is actually a hinge pin connected by toggle links in order to allow necessary swinging movement appurtenant to toggle connections. Reference to this figure also shows that a convenient handle or hand grip 36 is formed in the base section l6.

A vertically rising flange 38 is formed at the forward end of the base section I6 and has vertically rising grooves 40 and 4| formed therein accommodating the tongues 42 and 43, respectively. These tongues areintegrally formed with a the upstanding legs 44 and 46 of the guide or forward section 48 of the base. A hand operator 50 is carried by the upper surface of the base section 48 and bolts 52 and 54 are passed through suitable (unnumbered) apertures therein and also through slots 55 and 56 which are formed in the upstanding flange 38. By loosening the nuts on the bolts 52 and 54, the front or guide section 48 may be vertically adjusted in order to regulate the amount of cut taken by the cutter 20.

Side plates 60 and 62 which are fastened to the section l6 by means of screws form the sides for the cutter chamber. Conventional anti-friction bearings 64 and 66 are disposed in recesses formed in these sides and are held in place by means of retainers 61 and 68 (Figure 5). A cutter shaft 10 is passed through the anti-friction bearings and has a pulley 14 at one end thereof. A belt is adapted to be entrained around the pulleys l4 and 14 in order to drivingly connect the motor of the drill with the cutter shaft 10.

A cutter block 16 is fixed on the shaft 10 by means of a set screw 18 or the like. This shaft accommodates the slotted blades 19 and which are each slotted, as at BI and 82, so that the screws 84 may be passed therethrough and into the cutter block 16. Adjustment of the blades 19 and 80 on the cutter block 16 provides one adjustment as to the amount of cut taken by the device, and vertical adjustment of the forward or guide section 18 provides an additional adjustment.

From the foregoing, a clear understanding of the operation of the invention is deemed manifest. However, it is apparent that certain variations may be made and certain additions may be made, as the employment of the hingedly secured closure box 8! which is fastened to the base section 16 in order to cover the belt and pulley drive.

Having described the invention, what is claimed as new is:

1. A device for adapting an electric drill as a component of a portable jointer, said device comprising an elongated base having forward and rear sections, said rear section having a vertical flange at its forward end, a pair of vertical legs at the rear end of the forward section receiving the flange therebetween, said legs having inner faces contacting the flange, vertical ribs on the inner faces of said legs, said flange having vertical grooves accommodating said ribs to guide the sections during relative vertical movement thereof, said flange having vertical slots, fasteners extending through the legs and the slots to retain the flange adjusted longitudinally of the legs, said rear section having a flat bottom with a recess therein disposed behind the flange, a cutter supported in said recess for rotation, said rear section also including an upper portion provided with a drill-accommodating recess disposed directly above the'flrst-named recess, and means bridging the drill-accommodating recess to clampingly retain a drill in the last-named recess.

2. A device for adapting an electric drill as a component of a portable jointer, said device comprising an elongated base having forward and rear sections, said rear section having a vertion the inner faces of said legs, said flange having vertical grooves accommodating said ribs to guide the sections during relative vertical movement thereof, said flange having vertical slots, fasteners extending through the legs and the slots to retain the flange adjusted longitudinally of the legs, said rear section having a cutter chamber therein including an open bottom and sides, side plates removably secured to the rear section and covering the open sides of the chamber, said side plates having inner faces with opposed recesses therein, bearing races held in said recesses, a cutter in the chamber and having a supporting shaft journaled in said bearing races, said rear section having an upper portion with a drill-accommodating recess disposed directly over the chamber, and means attached to the upper portion and bridging the seat to clampingly retain a drill over the cutter.

JOSEPH J. KONOPA.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,103,814 Naglo July 14, 1914 1,192,849 Bridges Aug. 1, 1916 1,418,328 Power June 6, 1922 1,530,028 Billingsley Mar. 1'7, 1925 1,898,956 Harvie Feb. 21, 1933 2,017,531 Dodelin Oct. 15, 1935 2,395,268 Goodridge Feb. 19, 1946 2,519,526 Wilber Aug. 22, 1950 2,539,581 Holden Jan. 30, 1951 2,544,461 Leitzel Mar. 6, 1951 FOREIGN PATENTS Number Country Date 585,068 Great Britain Jan. 29, 1947 OTHER REFERENCES Converting Drill to Saw, Popular Science, page 194, April 1949. 

